Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f8392fad994341…

MALICIOUS

PDF

83.5 KB Created: 2021-07-01 18:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7caa219b236219c81cb1946d01171fcf SHA-1: 495661c9a57b11c4c254f1f2a78a95eafaa6a57b SHA-256: 37f8392fad994341396f4ad73157e5542d0ea499038f8ef2442abdd88b6f4222
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The document's structure and URL patterns are consistent with efforts to manipulate search engine rankings or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/icue5thboe5s8j29ss8vk9rkh8/31883983939.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/86330561dfaac2b2c4678591002dffab/83148347639.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/dexadoxuxufapujiluxir.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/katiwunibed.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/somagosuwumupijuwezator.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/93176218663.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bcdab4cab---jorefodagoluvokeviwaj.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0d4bf86ab73d35e0ca1e5b3882ac2538/19498102183.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/vetima.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/xemuminubitujaraj.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/gdoaoqsmoo3ch8dc4neveakqfa/dogamon.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4a689ff52---10879653233.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160805d77b3405---32349178328.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/7cc707f70ca4f3306dc2734f76d899cf/46102579947.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f6c35ec50---gaforaxadulilaropapiz.pdfIn PDF document text
    • http://babamoleskine.com/files/file/gosejagekul.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/00799d2478cae19be15f6ec150aa06bb/63789060503.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/xoselomimonikigodoxozewej.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a4e39ddc---996398659.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/86970331014.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/016499fbe77a4b75111c73c4774613e1/17153506372.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160772ca35730c---27731419663.pdfIn PDF document text
    • https://csodamalom.hu/files/files/jasizofosofilowobesagafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=important+physics+formulas+for+neetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 10908 bytes
SHA-256: b3ac6bd9284e2e363a53fe3759d507766344b87e94aeb86771718f3b56a3434e
font_02_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 17404 bytes
SHA-256: 367d9e5795a73def135defe16e3cb97ba31aeed183b0b243add5bce6ef529891

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